轻于鸿毛的英文：
lighter than a goose feather

参考例句：

Could be entirely of no significance
轻于鸿毛

Death could be of great import or without significance
死重于泰山，轻于鸿毛

lighter是什么意思：
n. 打火机，点火器；点火者；驳船
adj. 较轻的
v. 驳运

How to put lighter fluid in a lighter?
怎样给打火机打气呢？

The latter one is lighter.
后者较轻。

Oil is lighter than water.
油比水轻。

than是什么意思：
conj. 比，比较；与其...（宁愿...）；除了...（之外）；当，就
prep. 超过

It will be better than you think for.
情况将比你预料的好。

This was more than bathroom banter.
这可不仅仅是浴室中开玩笑的话而已。

Faith is stronger than reason.
宗教信仰比推理劝说更具威力.

goose是什么意思：
n. 鹅；鹅肉；傻瓜

This is a sticky goo of pineapple and coconut.
这是菠萝和椰子调成的黏稠物。

I consider it's a goo man.
我认为这是一个感伤的人。

Silly as a goose
像鹅一样蠢